document.write( "Question 855571: Judy's average on 4 tests is 80. What is the least that she can earn on her 5th test and still have a chance for an 85 average on her 7th test. \n" ); document.write( "
Algebra.Com's Answer #515517 by JulietG(1812)\"\" \"About 
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The total number of points available is 7 tests @ 100 points, or 700.
\n" ); document.write( "She wants to have at least an 85 average after 7 tests.
\n" ); document.write( "7 * 85 = 595.
\n" ); document.write( "She already has 4 * 80 = 320.
\n" ); document.write( "Since you're looking for the least on the 5th, assume that she scores 100 on the 6th and 7th.
\n" ); document.write( "320 + 100 + 100 + x = 595
\n" ); document.write( "520 + x = 595
\n" ); document.write( "Subtract 520 from each side
\n" ); document.write( "x = 75
\n" ); document.write( ".
\n" ); document.write( "If Judy scores 100 on test 6 and test 7, she will need a 75 or higher on test 5 to come out with an 85 average.
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